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Investments (Composition Of Current And Past Due Mortgage Loans On Real Estate) (Details) - USD ($)
$ in Millions
Mar. 31, 2019
Dec. 31, 2018
Mar. 31, 2018
Dec. 31, 2017
Mortgage Loans On Real Estate Aging [Abstract]        
Current $ 13,927 $ 13,198    
60 to 90 days past due 1 1    
Greater than 90 days past due 1    
Valuation allowance (1)      
Unamortized premium (discount) (3) (9)    
Total carrying value 13,925 13,190    
Commercial [Member]        
Mortgage Loans On Real Estate Aging [Abstract]        
Current 13,526 12,959    
Greater than 90 days past due    
Valuation allowance   $ (3) $ (3)
Unamortized premium (discount) (16) (17)    
Total carrying value 13,510 12,942    
Residential [Member]        
Mortgage Loans On Real Estate Aging [Abstract]        
Current 401 239    
60 to 90 days past due 1 1    
Greater than 90 days past due 1    
Valuation allowance (1)      
Unamortized premium (discount) 13 8    
Total carrying value $ 415 $ 248